the following codes uses FileUpload control to
upload file to server.it's a example for
uploading files to the server using asp.net
and c#.

A c# class can have both static and non static members.
static members is declared with the keyword static.

HttpCookie is a very good way to store small amount of data
in asp.net application/website.you can access cookie value in
any page once set in a page.cookie can stay for long time in the
user's computer.

following are couple of great open-source applications
created for Asp.net community.

most of the time we need to create reports while dealing
with statistical data or finacial data.statistics should be
available to download.this statistics or reports should be
in a easily understandable format like excel file format.

when you run your c# application there may be
unknown errors for various reasons.you can
view those errors to correct later.
better way is to store those errors in a online
file using webservice automatically.